I am trying to establish a minimum time "policy" between the occupation of points requiring accuracy and redundancy for confirmation. Things like existing corner monuments and control - not the random topo "x" shot.
There are other checks and procedures I require, but this post is solely about the time between occupations to ensure a sufficiently "new" constellation.
Currently, my instructions are:
1. If this is a multiple day survey, get the shots requiring redundancy on different days and preferably different times of day.
2. If this is a single day (or last day of the) survey, get me the longest time between occupations that leaves time for me to (a) download the observations from the field; (b) do some analysis/calcs; (c) push the corners to be set back to you; and (d) leaves time for you to set them before leaving; BUT
3. No sooner than 2 hours - even if this means you're going back tomorrow - with certain exceptions - not an absolute.
With 4 GPS/Glonass/Beidou/Galileo available to us, we don't really time/plan the GPS surveys anymore. The 2 hours is just my gut answer. I am wondering...what is the real minimum time specified in #3? I think I could go with 1 hour.
I would like opinions/input on the following:
I have heard some say it only needs to be 20 mins - seems short to me - what do you think?
Is anyone aware of any studies that have considered this (Midwest, North America)?
What are your policies for field crews regarding this issue and how did you arrive at them?
What are your experiences?
